code: def _add_one(x):
      return x + 1
  
file_path: chainercv/tests/links_tests/connection_tests/test_separable_conv_2d_bn_activ.py
imports: import unittest
  import chainer
  from chainer.backends import cuda
  from chainer.functions import relu
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links import SeparableConv2DBNActiv
  import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: _add_one(x) and returns: unknown